Positive Parity States in Even-Even Te Isotopes

The positive-parity collective states in the even-even ^116~130 Te isotopes are studied in the framework of interacting boson model. A schematic Hamiltonian able to describe the transition from U(5) to SU(3) dynamical symmetry is used. It is found that the spectra can be well described by the transition from vibration to rotation. The behavior of the 0₂⁺ state can be partially described by the model, suggesting that the state is mainly composed of the normal sd configuration, but is influenced by the cross-shell excitation across the Z = 50 shell.